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'default endpoint element' is not found anymore

I installed some times ago this usefull package and used it with Umbraco 4.5.2 on Azure without any problem.

I then forgot it for a while and need it again. But it's not working anymore... Each time I click on the 'Translate' button, I have this message in each language textfield, instead of the translated text.

Error: Could not find default endpoint element that references contract 'TranslatorService.LanguageService' in the ServiceModel client configuration section. This might be because no configuration file was found for your application, or because no endpoint element matching this contract could be found in the client element.

I don't know what happened but what I've read is that a reinstall of this package on my platform could be tricky. Is there a way to fix this bug manually ?

Something that could help is I was not able to find the <system.serviceModel> tag on my web.config file, even on my old backup. If this is the missing element, could you send me the complete sentence and the location on the web.config file so I can add it again manually.

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